Challenges of space 

 - Chicago:   The University of Chicago Press,    1962 
 - xviii, 377p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Science
<br/><br/><label>Subjects--Index Terms: </label>Astronomy 
<br/><br/><label>Universal Decimal Class. No.: </label>629.19  / K2